altimeter app

I'm an app developer and a few times a year I also go climb mountains.
I noticed that most apps in the App Store that measure your height aren't accurate and really don't look good.
So, my question is if anyone would be interested in such an app and if so which features it should really include.
Feel free to drop all your thoughts below!
If their is enough interest I will make an accurate altimeter app, I already searched a bit on the internet and I'm convinced that making a really accurate altimeter app, that requires no internet, is possible.

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